Air filtration system



FIG. 1 illustrates a view of the air filtration system showing the front, a side and the top.

FIG. 2 illustrates a view of the air filtration system showing the front.

FIG. 3 illustrates a view of the air filtration system showing the back.

FIG. 4 illustrates a view of the air filtration system showing the side, and portion of the front and back.

FIG. 5 illustrates a view of the air filtration system showing the top; and,

FIG. 6 illustrates a view of the air filtration system showing the underside. 

The ornamental design for an air filtration system, as shown and described. 